I have thought that the belt itself strongly resembled a police duty belt (gun belt). These come in a standard height of 2-1/4". The stitching, depending on the manufacturer, is pretty consistant with Fett's belt. Also, look at the holes punched out for the double buckle. Hmmm, add some brass grommets and do they look familiar?
This being said (and shown), I don't think that pouches at or under four inches in height is unrealistic.